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        OpenGL Overview
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                            <h2>The Industry's Foundation for High Performance Graphics</h2>
                            <p>OpenGL® is the most widely adopted 2D and 3D graphics API in the industry, bringing thousands of applications to a wide variety of computer platforms. It is window-system and operating-system independent as well as network-transparent. OpenGL enables developers of software for PC, workstation, and supercomputing hardware to create high-performance, visually compelling graphics software applications, in markets such as CAD, content creation, energy, entertainment, game development, manufacturing, medical, and virtual reality. OpenGL exposes all the features of the latest graphics hardware.</p>
                            <h3>OpenGL 4.6 at a glance</h3>

                            <p>The OpenGL 4.6 and OpenGL Shading Language 4.60 Specifications were released on July 31, 2017.</p>

                            <p>New features of OpenGL 4.6 include:</p>

                            <ul>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_gl_spirv.txt"><em>GL_ARB_gl_spirv</em></a> and <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_spirv_extensions.txt"><em>GL_ARB_spirv_extensions</em></a>
                                    to standardize SPIR-V support for OpenGL
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_indirect_parameters.txt"><em>GL_ARB_indirect_parameters</em></a> and <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_draw_parameters.txt"><em>GL_ARB_shader_draw_parameters</em></a>
                                    for reducing the CPU overhead associated with rendering batches of geometry
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_pipeline_statistics_query.txt"><em>GL_ARB_pipeline_statistics_query</em></a> and <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_transform_feedback_overflow_query.txt"><em>GL_ARB_transform_feedback_overflow_query</em></a>
                                    standardize OpenGL support for features available in Direct3D
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_texture_filter_anisotropic.txt"><em>GL_ARB_texture_filter_anisotropic</em></a>
                                    (based on <a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_texture_filter_anisotropic.txt">GL_EXT_texture_filter_anisotropic</a>) brings previously IP encumbered functionality into OpenGL to improve the visual quality of textured scenes
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_polygon_offset_clamp.txt"><em>GL_ARB_polygon_offset_clamp</em></a>
                                    (based on <a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_polygon_offset_clamp.txt">GL_EXT_polygon_offset_clamp</a>) suppresses a common visual artifact known as a “light leak” associated with rendering shadows
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_atomic_counter_ops.txt"><em>GL_ARB_shader_atomic_counter_ops</em></a> and <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_group_vote.txt"><em>GL_ARB_shader_group_vote</em></a>
                                    add shader intrinsics supported by all desktop vendors to improve functionality and performance
                                </li>
                                <li>
                                    <a href="https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_no_error.txt"><em>GL_KHR_no_error</em></a>
                                    reduces driver overhead by allowing the application to indicate that it expects error-free operation so errors need not be generated
                                </li>
                            </ul>

                            <p>New extensions to OpenGL 4.6 include:</p>

                            <ul>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/KHR/KHR_parallel_shader_compile.txt">GL_KHR_parallel_shader_compile</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_create_context_no_error.txt">WGL_ARB_create_context_no_error</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_create_context_no_error.txt">GLX_ARB_create_context_no_error</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects.txt">GL_EXT_memory_object</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects_fd.txt">GL_EXT_memory_object_fd</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects_win32.txt">GL_EXT_memory_object_win32</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects.txt">GL_EXT_semaphore</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects_fd.txt">GL_EXT_semaphore_fd</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_external_objects_win32.txt">GL_EXT_semaphore_win32</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_win32_keyed_mutex.txt">GL_EXT_win32_keyed_mutex</a></li>
                            </ul>

                            <h3>API &amp; GLSL specifications</h3>

                            <ul>
                                <li><a href="https://www.khronos.org/registry/OpenGL/specs/gl/glspec46.core.pdf">OpenGL 4.6 Core Profile Specification</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/specs/gl/glspec46.compatibility.pdf">OpenGL 4.6 Compatibility Profile Specification</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL/specs/gl/GLSLangSpec.4.60.pdf">OpenGL Shading Language 4.60 Specification</a></li>
                            </ul>

                            <h3>Additional Links</h3>

                            <p>Specifications and documentation for the OpenGL API and OpenGL Shading Language, as well as related APIs such as GLX, are available from <a href="https://www.opengl.org/">OpenGL.org</a>:</p>

                            <ul>
                                <li><a href="https://www.khronos.org/registry/OpenGL/index_gl.php">OpenGL Registry</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL-Refpages">OpenGL Libraries, Tools, etc. (formerly "SDK")</a></li>
                                <li><a href="https://www.khronos.org/registry/OpenGL-Refpages/gl4/">OpenGL Reference Pages</a></li>
                                <li><a href="https://www.khronos.org/developers/reference-cards/">OpenGL Reference Cards</a></li>
                                <li><a href="https://www.khronos.org/opengl/wiki">OpenGL Resources</a></li>
                            </ul>


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